You obviously just don't play the chords once, you strum a few times, but I don't think
I have to tell you that unless your an idiot.
then play Cmaj7, but you can slide from fret 2 on the A string to make it sound nicer
so the pattern is riff-C7M-G7-C7M-G7 then Am7-Em-G7-C7M
NOW REMEMBER - ONLY THE CMAJ7 IS PLAYED IN ITS NORMAL WAY
G7, AM7, AND EM WAX PLAYS THE VARIANTS
so for G7, always play that thing up there (the second thing I tabbed)
Am7 looks like